.page-about {
  --about-measure: 68ch;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-body {
  max-width: var(--about-measure);
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--sk-white);
  opacity: 0.88;
}

.page-about .about-caption {
  margin: 0.7rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--sk-dust);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  padding: clamp(1.5rem, 4vw, 2.75rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__title {
  margin: 0.75rem 0 1.25rem;
  font-size: clamp(2rem, 6.2vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: 0.03em;
  font-weight: 800;
  color: var(--sk-white);
}

.page-about .about-hero__lead {
  max-width: 46ch;
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 2rem 0 0;
  padding: 1.25rem 0 0;
  border-top: 2px solid var(--sk-line);
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2.25rem;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-about .about-hero__num {
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--sk-cyan);
  letter-spacing: 0.02em;
}

.page-about .about-hero__cap {
  font-size: 0.8125rem;
  color: var(--sk-dust);
  letter-spacing: 0.04em;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__img {
  width: 100%;
  border: 2px solid var(--sk-line);
  box-shadow: var(--sk-shadow);
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

/* ---------- 通用两栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 2rem;
}

.page-about .about-split__main {
  min-width: 0;
}

.page-about .about-split__note {
  align-self: start;
}

.page-about .about-note__title {
  margin: 0 0 0.5rem;
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sk-cyan);
}

.page-about .about-points {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
  max-width: var(--about-measure);
}

.page-about .about-points li {
  position: relative;
  padding: 0.1rem 0 0.1rem 1.5rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--sk-white);
  opacity: 0.85;
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--sk-orange);
}

.page-about .about-points strong {
  color: var(--sk-cyan);
  font-weight: 700;
}

/* ---------- 章节头 ---------- */
.page-about .about-sec-head {
  margin-bottom: 2rem;
}

.page-about .about-sec-head .sk-h2 {
  margin-top: 0.5rem;
  margin-bottom: 0.9rem;
}

.page-about .about-sec-head__lead {
  margin-bottom: 0;
}

/* ---------- 时间线 ---------- */
.page-about .about-band-figure {
  margin: 0 0 2.5rem;
  border: 2px solid var(--sk-line);
  background: var(--sk-card);
  overflow: hidden;
}

.page-about .about-band-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.85;
}

.page-about .about-timeline {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-rail {
  display: flex;
  gap: 0.35rem;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  flex: 0 0 auto;
  padding: 0.4rem 0.7rem;
  font-family: var(--sk-font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  color: var(--sk-dust);
  text-decoration: none;
  border-bottom: 2px solid var(--sk-line);
  transition: color 0.18s var(--sk-ease), border-color 0.18s var(--sk-ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--sk-white);
  border-bottom-color: var(--sk-dust);
}

.page-about .about-rail__link.is-active,
.page-about .about-rail__link[aria-current="true"] {
  color: var(--sk-cyan);
  border-bottom-color: var(--sk-cyan);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.75rem;
  border-left: 2px solid var(--sk-line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 2.25rem;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 0.55rem;
  left: calc(-1.75rem - 6px);
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  background: var(--sk-cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 0.55rem;
  font-size: 1.125rem;
  line-height: 1.5;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--sk-white);
}

.page-about .about-timeline__text {
  max-width: 54ch;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--sk-dust);
}

/* ---------- 使命短句带 ---------- */
.page-about .about-creed {
  background: var(--sk-void);
  border-top: 2px solid var(--sk-line);
  border-bottom: 2px solid var(--sk-line);
  padding: clamp(2.5rem, 8vw, 5rem) 0;
}

.page-about .about-creed__line {
  margin: 0;
  max-width: 30ch;
  font-size: clamp(1.35rem, 4.4vw, 2.5rem);
  line-height: 1.38;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--sk-white);
}

.page-about .about-creed__line em {
  font-style: normal;
  color: var(--sk-cyan);
  border-bottom: 4px solid var(--sk-cyan);
  padding-bottom: 0.08em;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 2rem;
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 2px solid var(--sk-line);
  box-shadow: var(--sk-shadow);
}

.page-about .about-team__body {
  min-width: 0;
}

.page-about .about-team__body .sk-h2 {
  margin: 0.5rem 0 1rem;
}

.page-about .about-roles {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-role {
  border: 2px solid var(--sk-line);
  background: var(--sk-card);
  box-shadow: var(--sk-shadow);
  padding: 1rem 1.1rem;
  transition: border-color 0.18s var(--sk-ease), box-shadow 0.18s var(--sk-ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-color: var(--sk-cyan);
  box-shadow: var(--sk-shadow-hover);
}

.page-about .about-role__name {
  margin: 0 0 0.45rem;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--sk-cyan);
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--sk-dust);
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-top: 2px solid var(--sk-line);
}

.page-about .about-flow__step {
  padding: 1.15rem 0 1.15rem 0;
  border-bottom: 2px solid var(--sk-line);
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num name"
    "num text";
  column-gap: 1rem;
  align-items: start;
}

.page-about .about-flow__num {
  grid-area: num;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--sk-orange);
  letter-spacing: 0.08em;
}

.page-about .about-flow__name {
  grid-area: name;
  margin: 0 0 0.3rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--sk-white);
}

.page-about .about-flow__step p {
  grid-area: text;
  margin: 0;
  max-width: 46ch;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--sk-dust);
}

/* ---------- 指标卡 ---------- */
.page-about .about-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-metric {
  border: 2px solid var(--sk-line);
  background: var(--sk-card);
  box-shadow: var(--sk-shadow);
  padding: 1.35rem 1.25rem 1.25rem;
  transition: border-color 0.18s var(--sk-ease), box-shadow 0.18s var(--sk-ease), transform 0.18s var(--sk-ease);
}

.page-about .about-metric:hover,
.page-about .about-metric:focus-visible,
.page-about .about-metric:focus-within {
  border-color: var(--sk-cyan);
  box-shadow: var(--sk-shadow-hover);
  transform: translate(-2px, -2px);
}

.page-about .about-metric__num {
  display: block;
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  line-height: 1.1;
  color: var(--sk-cyan);
  letter-spacing: 0.01em;
}

.page-about .about-metric__name {
  margin: 0.7rem 0 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--sk-white);
}

.page-about .about-metric__text {
  margin: 0 0 0.7rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--sk-white);
  opacity: 0.86;
}

.page-about .about-metric__scope {
  margin: 0;
  padding-top: 0.7rem;
  border-top: 1px solid var(--sk-line);
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--sk-dust);
}

/* ---------- 合作矩阵 ---------- */
.page-about .about-collab {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-collab__item {
  border: 2px solid var(--sk-line);
  background: var(--sk-night);
  padding: 1.15rem 1.1rem 1.2rem;
  transition: border-color 0.18s var(--sk-ease);
}

.page-about .about-collab__item:hover {
  border-color: var(--sk-cyan);
}

.page-about .about-collab__title {
  margin: 0.8rem 0 0.45rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--sk-white);
}

.page-about .about-collab__text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--sk-dust);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  border: 2px solid var(--sk-line);
  background: var(--sk-card);
  box-shadow: var(--sk-shadow);
  padding: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-cta__title {
  margin: 0 0 0.9rem;
}

.page-about .about-cta__lead {
  margin-bottom: 1.6rem;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-collab {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-hero__figure {
    margin-top: 2.75rem;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 3rem;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-timeline {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-rail {
    flex-direction: column;
    overflow: visible;
    position: sticky;
    top: 7.5rem;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    border-bottom: 0;
    border-left: 2px solid var(--sk-line);
    padding: 0.35rem 0 0.35rem 0.75rem;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--sk-dust);
  }

  .page-about .about-rail__link.is-active,
  .page-about .about-rail__link[aria-current="true"] {
    border-left-color: var(--sk-cyan);
  }

  .page-about .about-timeline__list {
    padding-left: 2.25rem;
  }

  .page-about .about-timeline__item::before {
    left: calc(-2.25rem - 6px);
  }

  .page-about .about-flow__step {
    grid-template-columns: 4rem 1fr;
    column-gap: 1.5rem;
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-collab {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-metric,
  .page-about .about-role,
  .page-about .about-collab__item,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-metric:hover,
  .page-about .about-metric:focus-visible,
  .page-about .about-metric:focus-within {
    transform: none;
  }
}